Audio-Technica's Acoustic Duct design produces clear, natural soundscape. Air pressure builds up inside the shell from the sound driver's vibrations. By designing a miniscule duct, it releases this pressure giving added clarity to sound production. The shell housing is assembled from precision cut aluminium alloy to form a perfectly fitting acoustic shell with no sound leakage. Swing adjustable hanger mechanism ensures a comfortable and secure fit around your ear. Type Close, Dynamic Driver Size 14.8mm Frequency Response 10~24,000 Hz Sensitivity 104dB/mW Impedance 16ohm Output 100mW Cord Length, Shape 0.6+0.6m, Y Weight 12g Weight in Retail box 80g Rubber Ring cap HP-EC7		Contents .. Audio-Technica EC707 0.6m Extension cord Pouch Supplied by Authorized Resellers in Japan. 1 year Japan Warranty from the day we sent your parcel. We can help you liaise with the maker in Japan. You will pay for postages to/from our Japan office. Singapore and Malaysia buyers can bring/post to us locally. We will deliver FREE to/from Japan. Return postage chargeable.